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Quasar catalogue for the astrometric calibration of the forthcoming ILMT survey
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- Quasars are ideal targets to use for astrometric calibration of large scale astronomical surveys as they have negligible proper motion and parallax. The forthcoming 4-m International Liquid Mirror Telescope (ILMT) will survey the sky that covers a width of about 27 arcminute. To carry out astrometric calibration of the ILMT observations, we aimed to compile a list of quasars with accurate equatorial coordinates and falling in the ILMT stripe. Towards this, we cross-correlated all the quasars that are known till the present date with the sources in the Gaia-DR2 catalogue, as the Gaia-DR2 sources have position uncertainties as small as a few milli arcsec (mas). We present here the results of this cross-correlation which is a catalogue of 6738 quasars that is suitable for astrometric calibration of the ILMT fields. In this work, we present this quasar catalogue. This catalogue of quasars can also be used to study quasar variability over diverse time scales when the ILMT starts its observations. While preparing this catalogue, we also confirmed that quasars in the ILMT stripe have proper motion and parallax lesser than 20 mas/yr and 10 mas, respectively.<br />Comment: 9 pages, 9 figures, Accepted in Journal of Astrophysics & Astronomy
- Subjects :
- Proper motion
Calibration (statistics)
media_common.quotation_subject
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astronomical survey
01 natural sciences
0103 physical sciences
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
media_common
Physics
010308 nuclear & particles physics
Astrophysics::Instrumentation and Methods for Astrophysics
Liquid mirror telescope
Astronomy and Astrophysics
Quasar
Astrometry
Astrophysics - Astrophysics of Galaxies
Space and Planetary Science
Sky
Astrophysics of Galaxies (astro-ph.GA)
Astrophysics::Earth and Planetary Astrophysics
Parallax
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....7e653a1760e7912fb0192cf84f4367ef
- Full Text :
- https://doi.org/10.48550/arxiv.2007.07157